From: Ramakrishnan Muthukrishnan <vu3rdd@gmail.com>
Date: Mon, 2 Jan 2012 15:14:55 +0000 (+0530)
Subject: test for internal definition and letrec
X-Git-Url: https://git.rkrishnan.org/pf/content/en/seg/running.html?a=commitdiff_plain;h=96cdf5478550693d1e236a53e3390e2d59d59940;p=sicp.git

test for internal definition and letrec
---

diff --git a/src/sicp/metacircular2-test.rkt b/src/sicp/metacircular2-test.rkt
index 563b0ec..a4c23ea 100644
--- a/src/sicp/metacircular2-test.rkt
+++ b/src/sicp/metacircular2-test.rkt
@@ -34,7 +34,35 @@
                             (* x z))
                          env1)
                    39
-                   "let* test"))))
+                   "let* test")
+     (eval '(define (f x)
+              (define (even? n)
+                (if (= n 0)
+                    true
+                    (odd? (- n 1))))
+              (define (odd? n)
+                (if (= n 0)
+                    false
+                    (even? (- n 1))))
+              (odd? x))
+           env1)
+     (check-equal? (eval '(f 2) env1) false "internal definitions")
+     (check-equal? (eval '(f 3) env1) true "internal definitions")
+     (eval '(define (f1 x)
+              (letrec ((even?
+                        (lambda (n)
+                          (if (= n 0)
+                              true
+                              (odd? (- n 1)))))
+                       (odd?
+                        (lambda (n)
+                          (if (= n 0)
+                              false
+                              (even? (- n 1))))))
+                (even? x)))
+           env1)
+     (check-equal? (eval '(f1 2) env1) true "internal definitions")
+     (check-equal? (eval '(f1 3) env1) false "internal definitions"))))
 
 
 (run-tests metacircular2-tests)
\ No newline at end of file